LTC1382CSW#TRPBF [Linear]
LTC1382 - 5V Low Power RS232 Transceiver with Shutdown; Package: SO; Pins: 18; Temperature Range: 0°C to 70°C;
| 型号： | LTC1382CSW#TRPBF |
| 厂家： | 
Linear |
| 描述： | LTC1382 - 5V Low Power RS232 Transceiver with Shutdown; Package: SO; Pins: 18; Temperature Range: 0°C to 70°C 驱动 光电二极管 接口集成电路 驱动器 |
| 文件： | 总8页 (文件大小：111K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LTC1382
5V Low Power
RS232 Transceiver
with Shutdown
U
FEATURES
DESCRIPTIO
TheLTC®1382isanultra-lowpower2-driver/2-receiver
RS232 transceiver that operates from a single 5V
supply. The charge pump requires only four space-
saving 0.1µF capacitors.
■
Operates from a Single 5V Supply
■
Low Supply Current: ICC = 220µA
■
ICC = 0.2µA in Shutdown Mode
■
ESD Protection Over ±10kV
■
Uses Small Capacitors: 0.1µF
The transceiver operates in one of two modes, Normal
and Shutdown. In the Normal mode, I is only 220µA
■
Operates to 120kBaud
CC
■
Output Overvoltage Does Not Force Current
with the driver outputs unloaded. In the Shutdown
mode, thechargepumpisturnedoff, thedriveroutputs
are forced into three-state, both receivers are off and
Back into Supplies
■
RS232 I/O Lines Can Be Forced to ±25V
Without Damage
I
drops to 0.2µA.
CC
■
Pin Compatible with LT1180A
The LTC1382 is fully compliant with all data rate and
overvoltage RS232 specifications. The transceiver can
operate up to 120kbaud with a 2500pF, 3kΩ load. Both
driver outputs and receiver inputs can be forced to
±25V without damage and can survive multiple ±10kV
ESD strikes.
U
APPLICATIO S
■
Notebook Computers
Palmtop Computers
■
, LTC and LT are registered trademarks of Linear Technology Corporation.
U
TYPICAL APPLICATIO
2-Drivers/2-Receivers with Shutdown
Quiescent and Shutdown Supply Current
vs Temperature
2
4
5
6
17
3
V
= 5V
CC
600
500
400
300
200
100
0
1.2
1.0
0.8
0.6
0.4
0.2
0
0.1µF
0.1µF
TEST CONDITION: V = 5V
CC
LTC1382
0.1µF
7
0.1µF
V
V
CC
CC
300k
12
15
LOGIC INPUT
232 OUTPUT
QUIESCENT
CURRENT
300k
11
13
8
LOGIC INPUT
232 OUTPUT
232 INPUT
SHUTDOWN
CURRENT
14
LOGIC OUTPUT
5k
–20
20
40
60
80
0
10
18
9
LOGIC OUTPUT
ON/OFF
232 INPUT
TEMPERATURE (°C)
5k
16
LTC1382 • TA02
LTC1382 • TA01
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1
LTC1382
W W
U W
U W
U
ABSOLUTE AXI U RATI GS
PACKAGE/ORDER I FOR ATIO
Supply Voltage (VCC) ................................................ 6V
Input Voltage
Driver ....................................... –0.3V to VCC + 0.3V
Receiver ............................................... – 25V to 25V
Digital Input............................... –0.3V to VCC + 0.3V
Output Voltage
ORDER PART
NUMBER
TOP VIEW
1
2
3
4
5
6
7
8
9
18 ON/OFF
NC
+
17
16
15
14
13
12
11
10
V
CC
C1
LTC1382CN
LTC1382CSW
LTC1382IN
+
V
GND
C1–
TR1 OUT
RX1 IN
RX1 OUT
TR1 IN
TR2 IN
RX2 OUT
+
C2
Driver .................................................... – 25V to 25V
Receiver .................................... – 0.3V to VCC + 0.3V
Short-Circuit Duration
LTC1382ISW
C2–
V–
TR2 OUT
RX2 IN
V+ ................................................................... 30 sec
V– ................................................................... 30 sec
Driver Output.............................................. Indefinite
Receiver Output.......................................... Indefinite
Operating Temperature Range
N PACKAGE
18-LEAD PDIP
SW PACKAGE
18-LEAD PLASTIC SO
TJMAX = 125°C, θJA = 65°C/W (N)
TJMAX = 125°C, θJA = 85°C/W (S)
LTC1382C ............................................... 0°C to 70°C
LTC1382I............................................ – 40°C to 85°C
Storage Temperature Range ................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
Consult LTC Marketing for parts specified with wider operating temperature
ranges.
DC ELECTRICAL CHARACTERISTICS
The ■ denotes specifications which apply over the full operating
temperature range. VCC = 5V, C1 = C2 = C3 = C4 = 0.1µF, VON/OFF = VCC, unless otherwise noted.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Any Driver
Output Voltage Swing
3k to GND
Positive
Negative
■
■
5.0
–5.0
7.0
– 6.5
V
V
Logic Input Voltage Level
Logic Input Current
Input Low Level (V
Input High Level (V
= High)
= Low)
■
■
1.4
1.4
0.8
V
V
µA
µA
mA
µA
OUT
2.0
OUT
V
V
= V
= 0V
■
■
5
–40
IN
IN
CC
–20
±12
±10
Output Short-Circuit Current
Output Leakage Current
Any Receiver
V
= 0V
±9
OUT
Shutdown or V = 0V (Note 3), V
= ±10V
OUT
■
±500
CC
Input Voltage Thresholds
Input Low Threshold
Input High Threshold
■
■
0.8
1.3
1.7
0.4
5
0.2
3.2
V
V
V
kΩ
V
V
2.4
1
7
Hysteresis
Input Resistance
Output Voltage
■
0.1
3
–10V ≤ V ≤ 10V
IN
Output Low, I
Output High, I
= – 1.6mA (V = 5V)
= 160µA (V = 5V)
■
■
0.4
OUT
CC
3.0
OUT
CC
Output Short-Circuit Current
Output Leakage Current
Sinking Current, V
Sourcing Current V
Shutdown (Note 3), 0V ≤ V
= V
–15
10
–40
20
1
mA
mA
µA
OUT
CC
= 0V
OUT
≤ V
■
10
OUT
CC
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2
LTC1382
DC ELECTRICAL CHARACTERISTICS
The ■ denotes specifications which apply over the full operating
temperature range. VCC = 5V, C1 = C2 = C3 = C4 = 0.1µF, VON/OFF = VCC, unless otherwise noted.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Power Supply Generator
+
V Output Voltage
I
I
I
I
= 0mA
= 8mA
= 0mA
8.0
7.5
–8.0
–7.0
V
V
V
V
OUT
OUT
–
V Output Voltage
OUT
OUT
= –8mA
Supply Rise Time
Shutdown to Turn-On
0.2
ms
Power Supply
V
Supply Current
No Load (Note 2), 0°C to 70°C
No Load (Note 2), – 40°C to 85°C
■
■
0.22
0.35
0.5
1.0
mA
mA
CC
Supply Leakage Current (V
Digital Input Threshold Low
Digital Input Threshold High
)
CC
Shutdown (Note 3)
■
■
■
0.2
1.4
1.4
10
0.8
µA
V
V
2.0
AC CHARACTERISTICS
The ■ denotes specifications which apply over the full operating temperature range.
VCC = 5V, C1 = C2 = C3 = C4 = 0.1µF, unless otherwise noted.
PARAMETER
CONDITIONS
R = 3k, C = 51pF
MIN
TYP
MAX
UNITS
Slew Rate
8
5
30
V/µs
V/µs
L
L
R = 3k, C = 2500pF
3
L
L
Driver Propagation Delay
(TTL to RS232)
t
t
(Figure 1)
(Figure 1)
■
■
2
2
3.5
3.5
µs
µs
HLD
LHD
Receiver Propagation Delay
(RS232 to TTL)
t
t
(Figure 2)
(Figure 2)
■
■
0.3
0.3
0.8
0.8
µs
µs
HLR
LHR
Note 1: Absolute Maximum Ratings are those values beyond which the life
of the device may be impaired.
Note 3: Measurements made in the Shutdown mode are performed
with V
= 0V.
ON/OFF
Note 2: Supply current is measured with driver and receiver outputs
unloaded.
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Driver Output Voltage
vs Temperature
Receiver Input Thresholds
vs Temperature
Supply Current vs Data Rate
10
8
45
40
35
30
25
20
15
10
5
2.2
2.0
1.8
1.6
R
= 3k
V
R
C
= 5V
OUTPUT HIGH
L
CC
L
L
= 3k
V
= 5V
CC
= 2500pF
6
2 DRIVERS ACTIVE
V
TH
V
= 4.5V
CC
4
2
0
V
TL
–2
–4
–6
1.4
1.2
1.0
OUTPUT LOW
V
= 4.5V
CC
V
= 5V
CC
–8
0
0
10
20
30
70
0
10
20
30
40
50
60
70
0
25
50
75
150 175
40
50
60
100 125
TEMPERATURE (°C)
DATA RATE (kBAUD)
TEMPERATURE (˚C)
LTC1382 • TPC01
LTC1382 • TPC02
LTC1382 • TPC03
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3
LTC1382
TYPICAL PERFOR A CE CHARACTERISTICS
U W
VCC Supply Current
vs Temperature
Driver Short-Circuit Current
vs Temperature
Receiver Short-Circuit Current
vs Temperature
18
16
14
12
10
8
18
16
14
12
10
8
50
40
30
20
10
–
I
SC
+
–
I
I
SC
SC
2 DRIVERS LOADED
= 3k
R
L
1 DRIVER LOADED
6
6
R
L
= 3k
4
4
+
I
SC
2
2
0
0
0
10
20
30
60
70
40
50
0
10
20
30
60
70
0
10
20
30
60
70
40
50
40
50
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
LTC1382 • TPC06
LTC1382 • TPC04
LTC1382 • TPC05
Driver Leakage in Shutdown
vs Temperature
Driver Output Waveforms
Receiver Output Waveforms
45
40
35
30
25
20
15
10
5
DRIVER
OUTPUT
RECEIVER
OUTPUT
RL = 3k
C
L = 2500pF
CL = 51pF
DRIVER
OUTPUT
RL = 3k
V
OUT
= –20V
INPUT
INPUT
V
= 20V
50
OUT
LTC1382 • TPC08
LTC1382 • TPC09
0
30
0
10
20
40
60
70
TEMPERATURE (°C)
LTC1349 • TPC05
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4
LTC1382
U
U
U
PI FU CTIO S
VCC: 5V Input Supply Pin. This pin should be decoupled
with a 0.1µF ceramic capacitor.
charge pump efficiency, the capacitor’s effective series
resistance should be less than 2Ω.
GND: Ground Pin.
TR IN: RS232 Driver Input Pins. Inputs are TTL/CMOS
compatible. The inputs of unused drivers can be left
unconnected since 300k input pull-up resistors to VCC are
included on chip. To minimize power consumption, the
internaldriverpull-upresistorsaredisconnectedfromVCC
in the Shutdown mode.
ON/OFF: TTL/CMOS Compatible Shutdown Pin. A logic
low puts the device in the Shutdown mode. Both driver
outputs are forced into three-state and the supply current
is 0.2µA.
V+: Positive Supply Output (RS232 Drivers). V+ ≅ 2VCC
–
TR OUT: Driver Outputs at RS232 Voltage Levels. Outputs
are in a high impedance state when in the Shutdown or
VCC = 0V. The driver outputs are protected against ESD to
±10kV for human body model discharges.
2V. This pin requires an external capacitor C = 0.1µF for
charge storage. The capacitor may be tied to ground or
VCC. With multiple devices, the V + and V– pins may share
a common capacitor. For large numbers of devices, in-
creasing the size of the shared common storage capaci-
tors is recommended to reduce ripple.
RX IN: Receiver Inputs. These pins can be forced to ±25V
withoutdamage. Thereceiverinputsareprotectedagainst
ESD to ±10kV for human body model discharges. Each
receiver provides 0.4V of hysteresis for noise immunity.
V–:NegativeSupplyOutput(RS232Drivers).V – ≅– (2VCC
– 2V). This pin requires an external capacitor C = 0.1µF for
charge storage.
C1+,C1–,C2+,C2–:CommutatingCapacitorInputs.These
pins require two external capacitors C = 0.1µF: one from
C1+ to C1– and another from C2+ to C2–. To maintain
RX OUT: Receiver Outputs with TTL/CMOS Voltage Lev-
els. Outputs are in a high impedance state when in the
Shutdown mode.
U W
W
SWITCHI G TI E WAVEFOR S
V
V
CC
CC
1.7V
RX
INPUT
DRIVER
INPUT
1.3V
1.4V
1.4V
0V
0V
+
V
V
CC
DRIVER
OUTPUT
RX
OUTPUT
2.4V
0V
0V
–
0.8V
V
0V
t
t
t
LHD
t
LHR
HLD
HLR
LTC1382 • F01
LTC1382 • F02
Figure 1. Driver Propagation Delay Timing
Figure 2. Receiver Propagation Delay Timing
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5
LTC1382
TEST CIRCUITS
Receiver Timing Test Load
Driver Timing Test Load
DRIVER
OUTPUT
RX
OUTPUT
DRIVER
INPUT
DRIVER
RX INPUT
RX
51pF
3k
51pF
LTC1382 • TA04
LTC1382 • TA03
ESD Test Circuit
2
4
5
6
17
3
V
= 5V
CC
0.1µF
LTC1382
0.1µF
7
0.1µF
0.1µF
V
V
CC
300k
300k
12
15
LOGIC INPUT
232 OUTPUT
CC
11
13
8
RS232
LOGIC INPUT
232 OUTPUT
232 INPUT
LINE PINS
PROTECTED
TO ±10kV
14
LOGIC OUTPUT
5k
10
18
9
LOGIC OUTPUT
ON/OFF
232 INPUT
5k
16
LTC1382 • TA05
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6
LTC1382
U
PACKAGE DESCRIPTIO
N Package
18-Lead PDIP (Narrow .300 Inch)
(Reference LTC DWG # 05-08-1510)
.900*
(22.860)
MAX
18
17
16
15
14
13
12
11
10
.255 ± .015*
(6.477 ± 0.381)
1
2
3
5
6
9
4
7
8
.300 – .325
(7.620 – 8.255)
.130 ± .005
(3.302 ± 0.127)
.045 – .065
(1.143 – 1.651)
.020
(0.508)
MIN
.065
(1.651)
TYP
.009 – .015
(0.229 – 0.381)
+.035
–.015
.325
.125
(3.175)
MIN
.018 ± .003
(0.457 ± 0.076)
.005
(0.127)
MIN
.100
(2.54)
BSC
+0.889
8.255
(
)
–0.381
NOTE:
INCHES
N18 0502
1. DIMENSIONS ARE
MILLIMETERS
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm)
SW Package
18-Lead Plastic Small Outline (Wide .300 Inch)
(Reference LTC DWG # 05-08-1620)
.050 BSC .045 ±.005
.030 ±.005
TYP
.447 – .463
(11.354 – 11.760)
NOTE 4
N
14 13
11
15
12
10
18 17 16
N
.325 ±.005
.420
MIN
.394 – .419
(10.007 – 10.643)
NOTE 3
1
2
3
N/2
N/2
9
RECOMMENDED SOLDER PAD LAYOUT
.291 – .299
(7.391 – 7.595)
NOTE 4
2
3
5
7
8
1
4
6
.037 – .045
(0.940 – 1.143)
.093 – .104
(2.362 – 2.642)
.010 – .029
(0.254 – 0.737)
× 45°
.005
(0.127)
RAD MIN
0° – 8° TYP
.050
(1.270)
BSC
.004 – .012
.009 – .013
(0.102 – 0.305)
NOTE 3
(0.229 – 0.330)
.014 – .019
.016 – .050
(0.356 – 0.482)
TYP
(0.406 – 1.270)
NOTE:
1. DIMENSIONS IN
INCHES
(MILLIMETERS)
S18 (WIDE) 0502
2. DRAWING NOT TO SCALE
3. PIN 1 IDENT, NOTCH ON TOP AND CAVITIES ON THE BOTTOM OF PACKAGES ARE THE MANUFACTURING OPTIONS.
THE PART MAY BE SUPPLIED WITH OR WITHOUT ANY OF THE OPTIONS
4. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)
1382fa
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tationthattheinterconnectionofitscircuitsasdescribedhereinwillnotinfringeonexistingpatentrights.
7
LTC1382
RELATED PARTS
PART NUMBER
LT1780/LT1781
LTC1383
DESCRIPTION
COMMENTS
5V, 2 Driver, 2 Receiver RS232 Transeivers
5V, 2 Driver, 2 Receiver RS232 Transceiver
5V, 2 Driver, 2 Receiver RS232 Transceiver
3.3V, 2 Driver, 2 Receiver RS562 Transceiver
3.3V, 2 Driver, 2 Receiver RS562 Transceiver
±15kV ESD per IEC 1000-4
220µA Supply Current, Narrow 16-pin SO
220µA Supply Current, 2 Receivers Active in Shutdown
220µA Supply Current, 2 Receivers Active in Shutdown
220µA Supply Current, Narrow 16-pin SO
LTC1384
LTC1385
LTC1386
1382fa
LW/TP 1002 1K REV A • PRINTED IN USA
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7487
8
■
■
(408) 432-1900 FAX: (408) 434-0507 linear.com
LINEAR TECHNOLOGY CORPORATION 1994
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